Polypeptide, dna molecule encoding the polypeptide, vector, preparation method and use

ABSTRACT

A polypeptide, a DNA molecule encoding the polypeptide, a vector, a preparation method and a use therefor are disclosed. The polypeptide comprises an amino acid sequence represented by formula (I) or formula (II): formula (I) comprises an amino acid sequence represented by SEQ ID NO: 1; formula (II) comprises an amino acid sequence obtained by subjecting the amino acid sequence represented by SEQ ID NO: 1 to modification, substituted, and deletion or addition of one or more amino acids. The polypeptide may be used in the preparation of drugs that treat or prevent diseases related to infections caused by bacteria, and can also be used in the preparation of drugs that promote tissue repair and wound healing.

The present application claims the priorities of Chinese Patent Application No. 201310300278.6, entitled “POLYPEPTIDE, DNA MOLECULE ENCODING THE POLYPEPTIDE, VECTOR, PREPARATION METHOD AND USE” filed with the Chinese State Intellectual Property Office on Jul. 17, 2013, and Chinese Patent Application No. 201410327573.5, entitled “POLYPEPTIDE, DNA MOLECULE ENCODING THE POLYPEPTIDE, VECTOR, PREPARATION METHOD AND USE” filed with the Chinese State Intellectual Property Office on Jul. 10, 2014, which are both incorporated herein by reference in their entirety.

FIELD OF THE INVENTION

The present invention relates to the field of biotechnology, particularly to a polypeptide, DNA molecule encoding the polypeptide, vector, preparation method and use.

BACKGROUND OF THE INVENTION

Among various wounds, no matter in the clinical treatment of various injuries such as burn injury, cold injury, crush injury, war injury, animal bite, nuclear radiation injury and combined injury, or in the open or closed wound, the prevention of infections, the promotion of tissue repair and the wound healing are always an everlasting subject matter in the treatment of wound.

Bacterial infections are cute systemic infections or local infections caused by pathogenic bacteria or opportunistic pathogenic bacteria invading the blood circulation or local environment for growth and propagation therein and producing toxins or other metabolites, which is clinically characterized by chills, hyperpyrexia, erythra, joint pain and hepatosplenomegaly, partly with infectious shock and migrated lesions. Especially in elders, children, persons with a chronic disease or immunodeficiency, or in persons with complications due to delayed treatment, the condition may develop to septicemia or septicopyemia.

There are various kinds of pathogenic bacteria or opportunistic pathogenic bacteria capable of infecting human, which can invade the tissues and organs in different sites in human, causing local or systemic inflammatory responses and various diseases.

In nonspecific infections (i.e., the pyogenic infections), common ones are furuncle, carbuncle, erysipelas, acute lymphangitis, acute lymphadenitis, paronychia, felon, lateral pyogenic tenosynovitis of fingers, bursitis, palm deep space infection, pyemia, bacteremia and others, caused by pathogenic bacteria such as Staphylococcus aureus, Streptococcus hemolyticus, Escherichia coli, Pseudomonas aeruginosa and the like. The infection may be caused by a single bacterium, or the infection may be a combined infection caused by several bacteria, and thus, it is important to have a broad spectrum for a clinic medicament.

Acne is also a nonspecific infection commonly and frequently occurred in adolescents, which sometimes occurs in middle-aged people. Clinical manifestations thereof include whitehead acne, blackhead acne, inflammatory papule, secondary abscess, hydatoncus or nodule, paining and itching. If infection happens, there may leave scars, influencing the appearance as well as physical and psychological health. Now, it is known that there are many pathogenic factors and segments playing a key role in the onset, progression and turnover of acne, among which the most important reason is microbial action in hair follicle and pilosebaceous units, wherein the first cause is anaerobic Propionibacterium acnes, and the second cause is aerobic Staphylococcus epidermidis and Staphylococcus aureu. Bacterial infection is an important pathogenic factor in the onset of acne.

A specific infection refers to tuberculosis, tetanus, gas gangrene, anthrax, pertussis, epidemic encephalomyelitis, gonorrhea, typhia, bacillary dysentery, diphtheria, each of which is an disease specifically caused by Mycobacterium tuberculosis, Clostridium tetani, Clostridium perfringens, Bacillus anthraci, Bordetella pertussis, Neisseria meningitides, Neisseria gonorrhoeae, Salmonella typhi, Shigella, Corynebacterium diphtheria, respectively. A specific infection is different from a general infection in terms of pathogenic bacteria, disease progression and treatment, etc., which are the main subjects in epidemiological studies.

Promotion of wound healing is one of the two problems in traumatology, which is equally as important as anti-infection. Recently, with the intervention of modern cell biology and molecular biology studies, cell activities and influence factors thereof during would healing have been observed in a large number of experiments, and it was considered that various growth factors were involved in the regulation of the wound healing process, with the possible mechanisms being very complex.

A chronic refractory infection wound surface is a general term for wound surfaces infected with bacteria in a chronic refractory wound on the body surface. The chronic refractory wound surface on the body surface is caused by a series of wounds and diseases. The wound surfaces which are developed on the body surface and do not heal for a long time mainly include traumatic ulcers, lower extremity venous ulcers, pressure ulcers and diabetic ulcers. Due to features such as development on the body surface, long course of disease, large influences on appearance, high incidence of complications and extremely high treatment expenses, there will be large influences on lives and qualities of patients, which is an important issue that modern society must face.

Among the chronic refractory wound surfaces on the body surface, 87% suffer from bacterial infections, mainly with Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli. Due to the long treatment course, a large majority of the bacteria on the wound surface would develop drug resistance in varying degrees; particularly when the refractory wound surface is infected with MRSA, MRCNS, erythromycin-resistant Streptococcus pyogenes, ESBL-producing Escherichia coli, imipenem-resistant Pseudomonas aeruginosa strains (IPM-R strains). Due to the lack of clinically effective medicaments for treatment, the serious consequences of amputation may happen.

Eczema is a skin inflammatory response having polymorphic skin damages and tendency of exudation, which is caused by various endogenous and exogenous factors, the etiology is unresolved and is believed to be multifactorial The subjective symptom is fierce pruritus. Recurrence risk is high and is accompanied by secondary bacterial infections, which cannot be cured for many years.

Regarding prevention of wound infections, a common drug is antibiotics; however, drug resistance of a pathogenic bacterium caused by antibiotics abuse has made no drug available for many wounds, resulting in systemic infections in patients: pyemia, bacteremia, serious injuries in other organs, or chronic refractory wound surfaces forming on the body surface. The drug resistance issue of antibiotics has become a global focus. Another hazard of the drug-resistance bacteria is that they can spread among populations between different regions or counties. Streptococcus pneumonia is a common etiological bacterium causing bacterial pneumonia. Recently, the drug resistance thereof to antibiotics has been on the rise, and there have been multi-drug resistant strains developed, which has become a troublesome problem in clinical infection control. Currently, many anti-bacterial infection drugs, mostly, have poor efficacy due to infections with drug-resistant bacteria, in particular methicillin-resistant Staphylococcus aureus (MRSA). Therefore, there is an urgent need to develop a new antiseptic substance.

Recently, studies on bioactive antiseptic peptides have become frontier science in antibiotics development in international pharmacies. There have been over 1300 antiseptic peptides successfully separated and identified currently, which were commonly characterized by a small molecular weight (12-100 amino acid residues), cationic polymer and amphiphilic construction. These bioactive substances referred to as peptide antibiotics, due to features such as pure living organism, strong stability and antiseptic ability, broad spectrum, no drug resistance, no toxic side effect and “three-induced” action, have been considered as optimal alternatives to the existing antibiotics. An active antiseptic active Ctryamp polypeptide or structurally homologous polypeptides thereof are naturally occurring antiseptic peptides molecules obtained from Chaerilus tryznai Kovarik. They can rapidly kill microorganisms (including drug-resistant bacteria produced by using traditional antibiotics) without producing drug resistance by itself, with different production mechanism, bactericidal mechanism and mode of action from traditional antibiotics, and from which the hydrolyzed amino acids may facilitate the generation of skin tissues.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a polypeptide, DNA molecule encoding the polypeptide, vector, preparation method and use. This antiseptic active polypeptide from Chaerilus tryznai Kovarik has a broad-spectrum and potent inhibitory effect on gram-positive bacteria, gram-negative bacteria, anaerobic bacterium and clinically drug-resistant pathogenic bacteria. It can promote both tissue repaire and wound healing, and is thus useful for the manufacture of a medicament for the treatment or prevention of diseases associated with nonspecific infections, specific infections caused by bacteria, anaerobic bacterium, in particular drug-resistant bacteria, as well as a medicament for promoting tissue repair and wound healing. The additives (such as additives of cosmetics, health products, feeds and others) as provided in the present invention containing the broad-spectrum antiseptic active polypeptide as effective ingredient can prevent the bacterial infections and promot the tissue repair. Thus, they are useful for the prevention of bacterial infections and promotion of tissue repair, resulting in a good prevention for bacterial infections and good promotion of skin tissue repair without any side effect.

In order to achieve the above objects of the present invention, the present invention provides the following technical solutions.

The present invention provides a polypeptide having any one of the amino acid sequences as set forth in (I) and (II):

(I) the amino acid sequence as set forth in SEQ ID NO: 1;

(II) amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids.

The present invention discloses a group of structurally homologous polypeptides of a Ctryamp polypeptide from Chaerilus tryznai Kovarik, of which the amino acid sequence is as set forth in SEQ ID NO: 1. Based on the mature peptide sequence (FIRIARLLRIF) of Ctryamp, its secondary structure was predicted by using on-line NPS@ server [DSC method (Discrimination of protein Secondary structure Class)]. Its secondary structure was shown as a diagram by using the software AHTHEPROT 2000. Results showed that, the Ctryamp contained 100% of α-Helix structure, had a typical amphiphilic α-Helix structure and comprised a large number of basic residues (Arg) with net positive charges. According to the helix diagram of the polypeptide sequence and by large numbers of point mutations on the polypeptide sequence FIRIARLLRIF of Ctryamp, it is found that the sequence FIX₁IAX₂LLX₃IF (X₁, X₂ and X₃ are any one of three basic amino acids His, Arg and Lys) (SEQ ID NO: 1) does not influence the amphiphilicity features thereof (Table 1). Therefore, the present invention provides a group of structurally homologous polypeptides (SEQ ID NO: 1) of a Ctryamp polypeptide from Chaerilus tryznai Kovarik.

In some embodiments of the present invention, the modification includes amidation, phosphorylation, methylation, acetylation, ubiquitination, glycosylation or carbonylation.

In other embodiments of the present invention, the modification is acetylation; specifically, a polypeptide produced with the modification has the amino acid sequence as set forth in SEQ ID NO: 52.

Preferably, the substitution is substitution with 1, 2, 3, 4 or 5 amino acids.

When substituted by one amino acid, the polypeptide does not have the amino acid sequence as set forth in SEQ ID NO: 21.

More preferably, a polypeptide produced with the substitution has any one of the following amino acid sequences:

the amino acid sequence as set forth in SEQ ID NO: 22;

the amino acid sequence as set forth in SEQ ID NO: 23;

the amino acid sequence as set forth in SEQ ID NO: 24;

the amino acid sequence as set forth in SEQ ID NO: 25;

the amino acid sequence as set forth in SEQ ID NO: 26;

the amino acid sequence as set forth in SEQ ID NO: 27.

Preferably, the deletion is deletion of 1, 2, 3, 4 or 5 amino acids. More preferably, the deletion is deletion of 1 or 2 amino acids. Further preferably, when the deletion is of 1 amino acid, the deleted amino acid residue is not at position 4 or 9.

More preferably, a polypeptide produced with the deletion has any one of the following amino acid sequences:

the amino acid sequence as set forth in SEQ ID NO: 28;

the amino acid sequence as set forth in SEQ ID NO: 29;

the amino acid sequence as set forth in SEQ ID NO: 32.

Preferably, the addition is addition of 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acids. When the addition is addition at the N terminal of the polypeptide having the amino acid sequence as set forth in SEQ ID NO: 1, addition of 1, 2, 3, 4 or 5 amino acids is preferred.

More preferably, a polypeptide produced with the addition has any one of the following amino acid sequences:

the amino acid sequence as set forth in SEQ ID NO: 36;

the amino acid sequence as set forth in SEQ ID NO: 37;

the amino acid sequence as set forth in SEQ ID NO: 38;

the amino acid sequence as set forth in SEQ ID NO: 39;

the amino acid sequence as set forth in SEQ ID NO: 40;

the amino acid sequence as set forth in SEQ ID NO: 41;

the amino acid sequence as set forth in SEQ ID NO: 42;

the amino acid sequence as set forth in SEQ ID NO: 43;

the amino acid sequence as set forth in SEQ ID NO: 44;

the amino acid sequence as set forth in SEQ ID NO: 45.

Preferably, it does not have the amino acid sequence as set forth in SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, or SEQ ID NO: 53 or SEQ ID NO: 54.

Preferably, the polypeptide provided in the present invention has an amino aide sequence as set forth in any one of SEQ ID NO: 2, SEQ ID NOs: 7 to 20, SEQ ID NOs: 22 to 29, SEQ ID NO: 32, SEQ ID NOs: 36 to 45 or SEQ ID NO: 52.

The present invention specifically discloses a Ctryamp polypeptide from Chaerilus tryznai Kovarik, which has the amino acid sequence as set forth in SEQ ID NO: 2. A precursor organizational form of the Ctryamp encodes 68 amino acid residues consisting of three portions, that is, a signal peptide (23 residues), mature peptide (11 residues) and precursor peptide (34 residues). As shown in FIG. 1, below the cDNA sequence is the deduced corresponding amino acid sequence; amino acids in the signal peptide are labeled in italic; amino acids in the mature peptide are amino acid in the shadowed area; and the underlined amino acids are for the precursor peptide of the C terminal. Therefore, the present invention provides an antiseptic peptide from Chaerilus tryznai Kovarik: FIRIARLLRIF (SEQ ID NO: 2).

The present invention further provides the use of the polypeptide for the manufacture of an antiseptic agent. The polypeptide has any one of the amino acid sequences as set forth in (I) and (II):

(I) the amino acid sequence as set forth in SEQ ID NO: 1;

(II) the amino acid sequence obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids;

wherein the modification includes amidation, phosphorylation, methylation, acetylation, ubiquitination, glycosylation or carbonylation; the substitution is substitution of 1, 2, 3, 4 or 5 amino acids; the deletion is deletion of 1, 2, 3, 4 or 5 amino acids; the addition is addition of 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acids; and the polypeptide does not have the amino acid sequence as set forth in SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 53 or SEQ ID NO: 54. Preferably, the polypeptide has the amino acid sequence as set forth in SEQ ID NO: 2.

In some embodiments of the present invention, the antiseptic agent is useful in inhibiting a bacterium.

In some embodiments of the present invention, the bacterium is a gram-positive bacterium and/or gram-negative bacterium.

The antiseptic results showed that, the synthetic Ctryamp polypeptide and structurally homologous polypeptides thereof had potent inhibitory effect on the growth of a standard gram-negative bacterium Escherichia coli CCTCCAB94012 and gram-positive bacterium Staphylococcus aureus CCTCCAB94004. At 6.25 μg/mL, the Ctryamp polypeptide and structurally homologous polypeptides thereof have an inhibition rate of 100% on the Escherichia coli CCTCCAB94012; while at 6.25 μg/mL, also have an inhibition rate of 100% on the Staphylococcus aureus CCTCCAB94004 (Table 2). It showed that the Ctryamp polypeptide had potent inhibitory effect on the proliferation of gram-negative bacteria, in particular, pathogenic Escherichia coli and Pseudomonas aeruginosa (Table 3), in which the Ctryamp polypeptide had a minimal inhibitory concentration of 8-16 μg/mL on Pseudomonas aeruginosa. The antiseptic results also showed that, the Ctryamp polypeptide had potent inhibitory effect on the proliferation of gram-positive bacterium bacteria and the growth of anaerobic bacterium bacteria (Table 3).

In some embodiments of the present invention, the gram-positive bacteria belong to Staphylococcus, Streptococcus, Enterococcus, Mycobacterium, anaerobic bacterium or Corynebacterium. The antiseptic results showed that, the synthetic Ctryamp polypeptide had potent inhibitory effect on clinically drug-resistant bacteria (methicillin-resistant Staphylococcus aureus, methicillin-resistant coagulase-negative staphylococci, erythromycin-resistant Streptococcus pyogenes, ESBL-producing Escherichia coli resistant to penicillin and cephalosporins, to monoamides, having cross drug-resistance to quinolones, aminoglycosides, sulfonamides, and imipenem-resistant Pseudomonas aeruginosa (IPM-R strain)) (Table 3).

The antiseptic results showed that, the chemically synthetic Ctryamp polypeptide had potent inhibitory effect on bacteria causing specific infections (including Bordetella pertussis, Clostridium tetani, Clostridium perfringens, Shigella, Salmonella typhi and Corynebacterium diphtheria) (Table 3).

In other embodiments of the present invention, the gram-negative bacterium belongs to Neisseria, Enterobacteriaceae, Pseudomonas, Acinetobacter, Bordetella or Haemophilus.

The present invention further provides the use of the polypeptide for the manufacture of a medicament for the prevention and/or treatment of bacterial infection disease and/or eczema. The polypeptide has any one of the amino acid sequences as set forth in (I) and (II):

(I) the amino acid sequence as set forth in SEQ ID NO: 1;

(II) amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids;

wherein the modification includes amidation, phosphorylation, methylation, acetylation, ubiquitination, glycosylation or carbonylation; the substitution is substitution of 1, 2, 3, 4 or 5 amino acids; the deletion is deletion of 1, 2, 3, 4 or 5 amino acids; the addition is addition of 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acids; and the polypeptide does not have the amino acid sequence as set forth in SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 53 or SEQ ID NO: 54. Preferably, the polypeptide has the amino acid sequence as set forth in SEQ ID NO: 2.

In some embodiments of the present invention, the bacterium in the use of the polypeptide for the manufacture of a medicament for the prevention and/or treatment of a bacterial infection disease and/or eczema is a gram-positive bacterium and/or gram-negative bacterium.

In some embodiments of the present invention, the gram-positive bacterium in the use of the polypeptide for the manufacture of a medicament for the prevention and/or treatment of a bacterial infection disease and/or eczema belongs to Staphylococcus, Streptococcus, Enterococcus, Mycobacterium, anaerobic bacterium or Corynebacterium.

In other embodiments of the present invention, the gram-negative bacterium in the use of the polypeptide for the manufacture of a medicament for the prevention and/or treatment of a bacterial infection disease and/or eczema belongs to Neisseria, Enterobacteriaceae, Pseudomonas, Acinetobacter, Bordetella or Haemophilus.

In some embodiments of the present invention, the infection in the use of the polypeptide for the manufacture of a medicament for the prevention and/or treatment of a bacterial infection disease and/or eczema is a nonspecific infection and/or specific infection.

In some embodiments of the present invention, the nonspecific infection in the use of the polypeptide for the manufacture of a medicament for the prevention and/or treatment of a bacterial infection disease and/or eczema is furuncle, carbuncle, erysipelas, acute lymphangitis, acute lymphadenitis, paronychia, felon, lateral pyogenic tenosynovitis of fingers, bursitis, palm deep space infection, pyemia or bacteremia.

In some embodiments of the present invention, the specific infection in the use of the polypeptide for the manufacture of a medicament for the prevention and/or treatment of a bacterial infection disease and/or eczema is tuberculosis, tetanus, gas gangrene, anthrax, pertussis, epidemic encephalomyelitis, gonorrhea, typhia, bacillary dysentery or diphtheria.

In some embodiments of the present invention, the infection is an infection caused by MRSA, MRCNS, erythromycin-resistant Streptococcus pyogenes, ESBL-producing Escherichia coli or imipenem-resistant Pseudomonas aeruginosa (IPM-R strain).

In other embodiments of the present invention, the infection is a local infection, systemic infection or toxic disease caused by Staphylococcus aureus.

In other embodiments of the present invention, the infection is a urinary system infection, septicemia or postoperative infection, caused by coagulase-negative staphylococci.

In other embodiments of the present invention, the infection is a pyogenic inflammation, rheumatic fever and acute glomerulonephritis, scarlatina, bacterial pneumonia, saprodontia, subacute bacterial endocarditis or newborn infection, caused by Streptococcus.

In other embodiments of the present invention, the infection is lobar pneumonia, trachitis, otitis media, meningitis, pleurisy, endocarditis or septicemia, caused by Streptococcus pneumonia.

In other embodiments of the present invention, the infection is puerperal septicopyemia in pregnant women, neonatal meningitis, postpartum infection, bacteremia, endocarditis, skin and soft tissue infection or osteomyelitis, caused by Streptococcus agalactiae.

In other embodiments of the present invention, the infection is a cardiovascular system infection or urinary tract infection, caused by Enterococcus.

In other embodiments of the present invention, the infection is a urinary tract infection, pyogenic abdominal infection, septicemia, endocarditis or diarrhea fever, caused by Enterococcus faecium.

In other embodiments of the present invention, the infection is endocarditis, cholecystitis, meningitis, urinary tract infection or wound infection, caused by Enterococcus faecalis.

In other embodiments of the present invention, the infection is epidemic encephalomyelitis caused by Neisseria meningitides.

In other embodiments of the present invention, the infection is gonorrhea caused by Neisseria gonorrhoeae.

In other embodiments of the present invention, the infection is a urinary system infection, parenteral pyogenic infection, intestinal infection or hemorrhagic colitis, caused by Escherichia.

In other embodiments of the present invention, the infection is bacillary dysentery caused by Shigella.

In other embodiments of the present invention, the infection is typhia and paratyphoid caused by Salmonella.

In other embodiments of the present invention, the infection is pneumonia, bronchitis, urinary tract infection, wound infection, meningitis or peritonitis, caused by Klebsiella pneumoniae.

In other embodiments of the present invention, the infection is antibiotic-associated hemorrhagic colitis caused by Klebsiella oxytoca.

In other embodiments of the present invention, the infection is pneumonia or meningitis caused by Citrobacter.

In other embodiments of the present invention, the infection is skin soft tissue infection, urinary tract infection, respiratory tract infection, abdominal infection, central nervous system infection, eye infection, wound infection, endocarditis or septicemia, caused by Enterobacter cloacae.

In other embodiments of the present invention, the infection is pneumonia, urinary tract infection, bacteremia or postoperative infection, caused by Serratia.

In other embodiments of the present invention, the infection is tetanus caused by Clostridium tetani.

In other embodiments of the present invention, the infection is a clinical infection such as gas gangrene or food poisoning caused by Clostridium perfringens.

In other embodiments of the present invention, the infection is an abdominal infection, female reproductive tract and pelvic infection or bacteremia, caused by asporous anaerobic bacterium.

In other embodiments of the present invention, the infection is diphtheria caused by Corynebacterium diphtheria.

In other embodiments of the present invention, the infection is acne, comedo caused by Corynebacterium acnes.

In other embodiments of the present invention, the infection is a wound infection, burn tissue infection and other local pyogenic infections, lung infection, urinary tract infection, otitis media, keratitis, endocarditis or septicemia, caused by Pseudomonas aeruginosa.

In other embodiments of the present invention, the infection is a respiratory tract infection, bacteremia, urinary tract infection, secondary meningitis, surgical site infection or ventilator-associated pneumonia, caused by Acinetobacter baumannii.

In other embodiments of the present invention, the infection is pertussis caused by Bordetella pertussis.

In other embodiments of the present invention, the infection is bacteremia in infants and children, acute bacterial meningitis, cellulitis, osteomyelitis or joint infection, caused by Haemophilus like Haemophilus influenza.

In other embodiments of the present invention, the infection is tuberculosis caused by Mycobacterium tuberculosis.

In other embodiments of the present invention, the infection is a chronic refractory infection wound surface.

In other embodiments of the present invention, the use of the polypeptides for the manufacture of a medicament for the prevention and/or treatment of eczema is provided.

The present invention further provides the use of a polypeptide for the manufacture of a medicament for the promotion of tissue repair and/or wound healing, wherein the polypeptide has any one of the amino acid sequences as set forth in (I) and (II):

(I) the amino acid sequence as set forth in SEQ ID NO: 1; and

(II) amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids;

wherein the modification includes amidation, phosphorylation, methylation, acetylation, ubiquitination, glycosylation or carbonylation; the substitution is substitution of 1, 2, 3, 4 or 5 amino acids; the deletion is deletion of 1, 2, 3, 4 or 5 amino acids; the addition is addition of 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acids, and the polypeptide does not have the amino acid sequence as set forth in SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 53 or SEQ ID NO: 54. Preferably, the polypeptide has the amino acid sequence as set forth in SEQ ID NO: 2.

The present invention further provides the use of the polypeptide for the manufacture of a medicament for the treatment of burn injury, cold injury, crush injury, war injury, animal bite, nuclear radiation injury or combined injury, wherein the polypeptide has any one of the amino acid sequences as set forth in (I) and (II):

(I) the amino acid sequence as set forth in SEQ ID NO: 1;

(II) amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids;

wherein the modification includes amidation, phosphorylation, methylation, acetylation, ubiquitination, glycosylation or carbonylation; the substitution is substitution of 1, 2, 3, 4 or 5 amino acids; the deletion is deletion of 1, 2, 3, 4 or 5 amino acids; the addition is addition of 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acids; and the polypeptide does not have the amino acid sequence as set forth in SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 53 or SEQ ID NO: 54. Preferably, the polypeptide has the amino acid sequence as set forth in SEQ ID NO: 2.

The present invention further provides a DNA molecule encoding the polypeptide as described above, which has any one of nucleotide sequences as set forth in I and II:

I. the nucleotide sequence as set forth in SEQ ID NO: 3;

II. nucleotide sequences obtained from the nucleotide sequence as set forth in SEQ ID NO: 3 with modification, substitution, deletion or addition of one or more bases.

The present invention provides the construction of a cDNA library of the venom gland tissue from Chaerilus tryznai Kovarik with high quality, specifically comprising the steps of: separating total RNA and purifying mRNA from the venom gland of Chaerilus tryznai Kovarik, synthesizing the first and second chains of cDNA, ligating and transforming into the double-strand cDNA and pSPORT1 vector, and obtaining the cDNA library of the venom gland tissue from Chaerilus tryznai Kovarik. Based on the library as constructed, 3000 clones were randomly selected and sequenced, among which the 2007^(th) clone was found to be a novel gene encoding the antiseptic peptide from Chaerilus tryznai Kovarik by sequence analysis, named Ctryamp and having the nucleotide sequence as set forth in SEQ ID NO: 3:

(FIG. 1) ttcctctgtgaaagtaagttctgtgaaactcactcttcgataaaatg aaatctcagacctttttccttctttttctagttgttttattattagc aatttcacaatcagaagcttttatcaggatcgccaggctcctcagga tctttggaaaaagaagtatgagagatatggatactatgaaatactta tatgaaccaagtagagtgcagctgacttgaaaaccttacaaaaacta atggaaaattactgattatttgaatataataatgttatctctatttt agattataaatatttcttttgaaaaaaaaaaaaaaaaaaaaa.

The present invention further provides a recombinant vector comprising the DNA molecule as described above.

The present invention further provides a method for preparing the polypeptide, comprising the steps of:

obtaining a DNA molecule encoding the amino acid sequence as set forth in (I) or (II), wherein

(I): the amino acid sequence as set forth in SEQ ID NO: 1, and

(II): amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids;

fusing the DNA molecule with an expression vector to construct a recombinant expression vector;

transforming the recombinant expression vector into a host cell to obtain a transformant; and

inducing the transformant to express a protein, and then performing the separation and purification to obtain the product.

In some embodiments of the present invention, the DNA molecule in the method for preparing the polypeptide is any one of the nucleotide sequences as set forth in I and II:

I. the nucleotide sequence as set forth in SEQ ID NO: 3;

II. nucleotide sequences obtained from the nucleotide sequence as set forth in SEQ ID NO: 3 with modification, substitution, deletion or addition of one or more bases.

In some embodiments of the present invention, the host cell is a prokaryotic host cell or eukaryotic host cell.

Preferably, the prokaryotic host cell is Escherichia coli.

The present invention further provides a pharmaceutical formulation for the treatment of a wound surface infection and/or the promotion of tissue repair and healing consisting of a polypeptide and a pharmaceutically acceptable carrier, in which the polypeptide has any one of the amino acid sequences as set forth in (I) and (II):

(I) the amino acid sequence as set forth in SEQ ID NO: 1;

(II) amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids;

wherein the modification includes amidation, phosphorylation, methylation, acetylation, ubiquitination, glycosylation or carbonylation; the substitution is substitution of 1, 2, 3, 4 or 5 amino acids; the deletion is deletion of 1, 2, 3, 4 or 5 amino acids; the addition is addition of 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acids; and the polypeptide does not have the amino acid sequence as set forth in SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 53 or SEQ ID NO: 54. Preferably, the polypeptide has the amino acid sequence as set forth in SEQ ID NO: 2. In some embodiments of the present invention, the polypeptide accounts for 0.01%-1.5% by weight of the pharmaceutical formulation.

In some embodiments of the present invention, the carrier includes hydroxypropylmethylcellulose, which accounts for 7.0% by weight of the pharmaceutical formulation.

Preferably, by weight, the pharmaceutical formulation provided in the present invention consists of 0.01%˜1.5% polypeptide, 5% glycerol, 7% hydroxypropylmethyl cellulose, 0.1% glycolic acid, 0.1% EDTA, with the balance of water.

Preferably, the pharmaceutical formulation provided in the present invention is a gel, powder for injection, aerosol, spray, liniment, film, patch, cream, ointment, adhesive plaster, liquid, decoction, granule, tablet, pill, sustained-release agent, controlled-release agent, powder, paste, liniment, lotion, smeared film, penetration ions, eye drop, nasal drop, gargle, sublingual tablet, insufflating agent, suppository, aerosol, inhalant, fumicant, oral solution, oral tablet, injection, syrup, electuary, vinum, pulvis, granule, pill, tablet, capsule, enema or suppository.

The present invention further provides the use of a polypeptide for the manufacture of a feed, health product, food and cosmetic additive, wherein the polypeptide has any one of the amino acid sequences as set forth in (I) and (II):

(I) the amino acid sequence as set forth in SEQ ID NO: 1;

(II) amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids;

wherein the modification includes amidation, phosphorylation, methylation, acetylation, ubiquitination, glycosylation or carbonylation; the substitution is substitution of 1, 2, 3, 4 or 5 amino acids; the deletion is deletion of 1, 2, 3, 4 or 5 amino acids; the addition is addition of 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acids; and the polypeptide does not have the amino acid sequence as set forth in SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 53 or SEQ ID NO: 54. Preferably, the polypeptide has the amino acid sequence as set forth in SEQ ID NO: 2.

The present invention provides a polypeptide having any one of the amino acid sequences as set forth in (I) and (II):

(I) the amino acid sequence as set forth in SEQ ID NO: 1;

(II) amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids. The antiseptic results show that, the synthetic Ctryamp polypeptide and the structurally homologous polypeptides thereof have potent inhibitory effect on the growth of a standard gram-negative bacterium Escherichia coli CCTCCAB94012 and gram-positive bacterium Staphylococcus aureus CCTCCAB94014. At 6.25 μg/mL, the Ctryamp polypeptide and structurally homologous polypeptides thereof have an inhibition rate of 100% on the Escherichia coli CCTCCAB94012; while at 6.25 μg/mL, have an inhibition rate of 100% on the Staphylococcus aureus CCTCCAB94014 (Table 3). Further antiseptic results show that, the synthetic Ctryamp polypeptide has potent inhibitory effect on the proliferation of a gram-negative bacterium, in particular pathogenic Escherichia coli and Pseudomonas aeruginosa (Table 3), in which the Ctryamp polypeptide has a minimal inhibitory concentration of 8-16 μg/mL on Pseudomonas aeruginosa. The antiseptic results also show that, the chemically synthesized Ctryamp polypeptide has potent inhibitory effect on the proliferation of a gram-positive bacterium (Table 3). The antiseptic results show that, the Ctryamp polypeptide has potent inhibitory effect on the growth of anaerobic bacterium (Table 3). The Ctryamp polypeptide has potent inhibitory effect on clinically drug-resistant bacteria (methicillin-resistant Staphylococcus aureus, methicillin-resistant coagulase-negative staphylococci, erythromycin-resistant Streptococcus pyogenes, ESBL-producing Escherichia coli resistant to penicillin and cephalosporins, to monoamides, having cross drug-resistance to quinolones, aminoglycosides, sulfonamides, imipenem-resistant Pseudomonas aeruginosa (IPM-R strain)) (Table 3). The Ctryamp polypeptide has potent inhibitory effect on bacteria causing specific infections (including Bordetella pertussis, Clostridium tetani, Clostridium perfringens, Shigella, Salmonella typhi and Corynebacterium diphtheria) (Table 3).

The present invention further provides a topical antiseptic gel formulation. The antiseptic results showed that, the antiseptic formulation had potent inhibitory effect on gram-positive bacteria, gram-negative bacteria, anaerobic bacterium and clinically drug-resistant bacteria. The antiseptic formulation has a minimal inhibitory concentration MIC of 6.25 μg/mL against the standard gram-negative bacterium Escherichia coli CCTCCAB94012, has a minimal inhibitory concentration MIC of 6.25 μg/mL against the gram-positive bacterium Staphylococcus aureus CCTCCAB94004, has a minimal inhibitory concentration MIC of 6.25 μg/mL against methicillin-resistant Staphylococcus aureus, has a minimal inhibitory concentration MIC of 8 μg/mL against Pseudomonas aeruginosa, and has a minimal inhibitory concentration MIC of 25 μg/mL against Clostridium perfringens (Table 4) (calculated based on the active ingredient antiseptic Ctryamp polypeptide or the structurally homologous polypeptides thereof for the formulation).

Patients with various traumas and patients with chronic refractory infection wound surfaces on the body surface coming to hospital for treatment were selected. They were randomly divided into an experimental group and a control group. The experimental group was administered with the topical Ctryamp polypeptide antiseptic gel formulation as prepared, while the control group was administered with conventional drug (administered with 5% Sulfur Cream). For bacterial infections on the wound surface, all of the 82 patients in the treatment group experienced wound surface healing in the first phase, without any infections or delayed healing of the wound surface, and without any allergic reaction or other adverse reactions. In accordance with the Antibacterial Drug Clinical Trial Technical Standards issued by the Ministry of Health in 1988, four ranks are divided to evaluate efficacy: healing, significant, effective, ineffective. Results showed that in the 82 cases of the treatment group, 80 cases were significant and 2 cases were effective, giving an effective rate of 100%. In the 74 cases of the control group, 50 cases were significant, 20 cases effective and 4 cases ineffective, giving an effective rate of 95%. Statistical F-test between two groups was significant, p<0.05. Comparison of time for the promotion of wound surface healing between the two groups is shown in Table 5. By statistical F-test, p<0.05. Clinical treatment results showed that the topical gel provided in the present invention is capable of effectively preventing and treating bacterial infections, with unique antiseptic effect on MRSA and imipenem-resistant Pseudomonas aeruginosa (IPM-R strain) in particular, while is capable of significantly promoting repair and healing of a wound.

For clinical observation of acne treatment, 258 patients with acne, pimple, comedo were selected as the subjects. The number of facial acne skin damages, the changes and adverse reactions were recorded with the patients of the two groups, an experimental group (treated with a topical Ctryamp polypeptide antiseptic gel formulation) and a control group. The efficacy was analysized based on the total percentage of reduction of various damages (comedo, inflammatory scars, abscesses, nodules or cystides) caused by acne. In the experimental group with an antiseptic formulation against Propionibacterium acnes, the effective rate was 97%, while it was 41% in the control group with conventional administration. There was highly significant difference in effective rate between the two groups, suggesting that the efficacy on acne treatment in the experimental group was superior to the control group.

In the Burn and Plastic Surgery Unit of the People's Hospital of Hubei Province, 22 patients with chronic eczema were treated with the topical Ctryamp polypeptide antiseptic gel formulation of the present invention. The experimental results showed that, the antiseptic gel of the peptide from Chaerilus tryznai Kovarik had a unique efficacy in treating eczema, with a curative rate of 100%. During the clinical follow-up visits, there was no relapse; whereas in the experimental group, clinical symptoms were reduced but there were severe relapses during follow-up visits.

The present invention further provides a novel medicament, which is more effective in treating wound surface bacterial infection, acne and eczema. The novel medicament is formulated with an active polypeptide from the traditional Chinese medicinal material scorpion as an active ingredient. The medicament has significant therapeutic effect for the treatment of wound surface bacterial infections, chronic refractory infection wound surfaces on the body surface, acne and eczema, and for the promotion of tissue repair and wound healing. The present invention also relates to an additive for the prevention of bacterial infections and promotion of tissue repair, which is useful for the manufacture of a cosmetic, health product and feed, with significant effect on the prevention of bacterial infections and the promotion of skin tissue repair. The raw materials employed in the present invention are all active ingredients in the traditional Chinese medicinal material scorpion, with no toxic side effect and no sequel. Such a medicament or additive is capable of truly taking effect rapidly, with no side effects and no relapses after treatment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the gene sequence of the broad-spectrum antiseptic active Ctryamp polypeptide from Chaerilus tryznai Kovarik provided in the present invention and the amino acid sequence thereof.

FIG. 2 shows the purity of the antiseptic active Ctryamp polypeptide from Chaerilus tryznai Kovarik.

FIG. 3 shows a mass spectrum of the antiseptic active Ctryamp polypeptide from Chaerilus tryznai Kovarik.

DETAILED DESCRIPTION OF THE INVENTION

The present invention discloses a polypeptide, DNA molecule encoding the polypeptide, vector, preparation method and use, which can be embodied by those skilled in the art through suitable modifications of the process parameters in view of the disclosure herein. It is to be particularly indicated that, all similar substitutions and alterations are obvious to those skilled in the art, which will be deemed to be included in the present invention. The method and use of the present invention has been described by ways of preferred examples. Thus, those skilled in the art can embody and apply the technology of the present invention by alteration, suitable change or combination of the method and use as described in the present invention, without departing from the content, spirit and scope of the present invention.

The present invention will be further illustrated in conjunction with examples in the following.

Example 1 Preparation of the Gene for the Broad-Spectrum Antiseptic Active Polypeptide from Chaerilus tryznai Kovarik

A: Extraction of Total RNA from the Venom Gland of Chaerilus tryznai Kovarik (Trizol LS One-Step Method: Trizol LS was Purchased from Invitrogen, USA)

(1) 500 mg of the venom gland from the scorpion's tail was ground into fine powders in liquid nitrogen, added with 10 mL of TRIZOL reagent with well mixing, and placed at room temperature (20-25° C., the same as hereinafter) for 5 min. (2) 2 mL chloroform was then added with mixing for 15 s, placed at room temperature for 2-3 min, and centrifuged at 12000 g and 4° C. for 15 min. (3) The aqueous phase was taken out and added with same volume of isopropanol, then placed at room temperature for 10 min, and centrifuged at 12000 g and 4° C. for 10 min to obtain RNA precipitate. (4) The precipitate was washed with 5 ml of 75% ethanol and centrifuged at 7500 g for 5 min. (5) The RNA precipitate was dried followed by dissolution in DEPC treating water, kept at 55-60° C. for 10 min to completely dissolve RNA. All the process was performed in accordance with the method recommended by TRIZOL (Total RNA Isolation) Reagent Kit. The quality of the prepared total RNA from the scorpion venom gland was detected by using formaldehyde-denatured gel electrophoresis. High-quality total RNA from the scorpion venom gland was obtained.

B: Separation and Purification of mRNA

mRNA was separated and purified by using a PolyA Trace mRNA separation system (Promega, USA), the operating principle of which was that, based on the property of complementary pairing between the Oligo(dT) and poly(A) tail at 3′ end of the mRNA, Oligo(dT) was labeled with biotin and formed a hybrid with the poly(A) at 3′ end of the mRNA through annealing, and then the biotin Oligo(dT)/mRNA hybrid was captured and washed by magnetic beads labeled with avidin and a magnetic separation rack, and finally eluted with sterilized double distilled water (ddH₂O) free of a RNA enzyme, thus to separate mRNA from the total RNA. (1) Sample preparation: The RNA was added into 800 μL binding buffer containing 32 μL β-mercaptoethanol. (2) Probe annealing: 5 μL it of Oligo(dT) at a concentration of 250 pM was added with distilled water up to 50 μL; and added with 1.6 mL preheated dilution buffer (a dilution buffer added with 32 μL β-mercaptoethanol), mixed with RNA uniformly and incubated at 70° C. for 5 min. (3) Magnetic bead activation: 1.2 mL magnetic beads SA-PMPS (purchased from Promega, USA) was charged into a 1.5 mL centrifuge tube and resuspended with 0.5×SSC, the magnetic beads was absorbed on the magnetic rack and SA-PMPS was washed with 0.5×SSC in the original volume three times. (4) mRNA acquisition: RNA incubated at 70° C. was mixed with SA-PMPS, placed at room temperature for 5 min, and then on the magnetic rack for magnetic bead absorption, with the supernatant removed; the magnetic bead with 2 mL of 0.5×SSC, washed repeatedly twice, with SSC being removed to the greatest extent in the last time, and then added with ddH₂O free of a RNA enzyme with mixing gently and uniformly, centrifuged (12000 g×3 min) or absorbed on the magnetic rack; the supernatant was taken to obtain mRNA. The mRNA was determined by electrophoresis and ultraviolet for its concentration and purity. (5) mRNA precipitation: the mRNA obtained in (4) was added with anhydrous ethanol with a volume of 2.5 times and glycogen for precipitation overnight. The mRNA was used for cDNA synthesis.

C: Synthesis of the First Strand of cDNA

(1) Into a 1.5 mL Ep tube 2 μL Not I Primer-adapter and 6 μL mRNA (comprising 3 μg mRNA) were added, incubated at 70° C. for 10 min and rapidly placed onto ice; after centrifugation, the following ingredients were added: 4 μL 5× first strand buffer; 2 μL 0.1 M DTT; 1 μL 10 mM dNTPs, 1 μL H₂O, followed by mixing gently and centrifugation, it was left at 37° C. for 2 min. (2) 5 μL reverse transcriptase was added, and mixed uniformly; 2 μL of the solution was added with 1 μL [α-³²P]dCTP (4 μCi) (tracing tube). Simultaneously with the above reaction components (sample tube), the tracing tube was incubated at 37° C. for 1 hour and then placed onto ice for stopping the reaction. (3) For the tracing tube, 43 μL 20 mM EDTA and 5 μL yeast tRNA was added in sequence, and after mixed uniformly, two 10 μL samples were taken out respectively and pointed on two filter membranes, in which one was washed with 10% TCA three times, each for 5 min, with 95% ethanol once, dried in the air and placed into 1.5 mL scintillation solution (Sample 1); while the other was dried in the air and placed into 1.5 mL scintillation solution (Sample 2). Additional 30 μL tracing solution was added with 1.5 μL 7.5 M ammonium acetate (NH₄Oac) and 90 μL anhydrous ethanol (−20° C.), and centrifuged at 14,000 rpm for 20 min immediately after bing mixed uniformly, with the supernatant discharged; the precipitate was added with 0.5 mL 70% anhydrous ethanol (−20° C.), centrifuged at 14,000 rpm for 2 min, with the supernatant discharged, and then dried at 37° C. for 10 min to allow volatilization of ethanol, dissolved in 10 μL TEN solution and added with 10 μL 2× loading buffer, with 10 μL taken for basic gel electrophoresis. λDNA HindIII fragments were labeled with [α-³²P]dCTP for use as molecular weight markers. (4) After being mixed uniformly, it was placed at room temperature for 15 min, added with 2 μL 0.2 M EDTA to stop the reaction. 6 μL of the reaction solution was mixed with 6 mL 2× basic gel electrophoresis buffer uniformly, and after electrophoresis for 5 h, soaked in 7% TCA for 20 min until bromphenol blue became yellow, which was suck dry by hygienic papers (for about 8 h) to go through autoradiography. (5) For the sample tube, it was used for synthesis of a second chain.

Hind III 10X buffer 2 μL dGTP 0.2 mM dATP 0.2 mM [α-³²P]dCTP 2 μCi Hind III markers 1 μg Klenow DNA polymerase 2 unit Total volume with ddH₂O addition 20 μL

D: Synthesis of the Second Strand of cDNA

(1) On the ice the following ingredients were added into the sample tube. (2) After being mixed gently until a uniform, it was incubated at 16° C. for 2 h. (3) 2 μL (10 units) T₄DNA polymerase was added to continue the reaction at 16° C. for 5 min. (4) It was transferred onto the ice and added with 10 μL 0.5 M EDTA. (5) An equal volume (150 μL) phenol/chloroform/isoamylol (25/24/1) was added with complete vortex mixing and then centrifuged at 14,000 rpm and room temperature for 5 min. An aqueous phase (140 μL) was transferred into another 1.5 mL Ep tube. (6) 70 μL 7.5 M NH₄OAc and 0.5 mL anhydrous ethanol (−20° C.) were added, and after vortex mixing, centrifugation was performed at 14,000 rpm for 20 min at room temperature. (7) After the supernatant was discharged, 0.5 mL 70% ethanol (−20° C.) was added, followed by centrifugation for 2 min the same as above. With the supernatant discharged, the precipitate was dried at 37° C. for 10 min.

DEPC-treated water 92 μL 5X second strand buffer 30 μL 10 mM dNTP mix 3 μL E. coli DNA ligase (10 units/μL) 1 μL E. coli DNA polymerase (10 units/μL) 4 μL E. coli RNase H (2 units/μL) 1 μL Total volume 150 μL

E: Ligation of Double-Strand cDNA with Sal I Adapters

(1) The cDNA sample in D was dissolved with 25 μL sterilized water, and then added with ingredients in the table below in sequence. (2) After being mixed gently into a uniform, reaction was carried out at 16° C. overnight (about 20 h). (3) After being extracted with phenol/chloroform/isoamylol (25/24/1) and precipitated with NH₄Oac/ethanol, it was dried at 37° C. for 10 min.

5X T₄DNA ligase buffer 10 μL Sal I adapters 10 μL T₄DNA ligase  5 μL Total volume 50 μL

F: Digestion of Double-Strand cDNA with not I

(1) The sample in E was dissolved in 41 μL, and then added with ingredients in the table below in sequence. (2) After being mixed uniformly, it was incubated at 37° C. for 2 h. (3) It was extracted with phenol/chloroform/isoamylol (25/24/1) once and then precipitated with 7.5 M NH₄Oac/ethanol, dried at 37° C. for 10 min. (4) It was dissolved in 70 μL TEN, with 1 μL for quantitation, and the remaining being stored at −20° C. for further use.

REACT 3 buffer 5 μL Not I 4 μL Total volume 50 μL 

G: Removal of Excess Sal I Adaptors and Enzymatically Digested Small Fragments from the Double-Strand cDNA Molecule

Excess Sal I adaptors and enzymatically digested small fragments were removed by using a nucleon extraction and purification kit (Amersham, USA). (1) Resins were suspended at room temperature, in which 600 μL was added onto a centrifugal column for centrigugation at 2000 rpm for 10 s, with the liquid removed. 40 μL, of the above cDNA solution was added in the center of the resins and centrifuged the same as above. (2) The eluted solution was collected for a ligation reaction.

H: Ligation and Transformation of Double-Strand cDNA and a pSPORT1 Vector

(1) The following ingredients were added into a 1.5 mL Ep tube in sequence. (2) Reaction was carried out at room temperature for 16 h. (3) The following ingredients were added in the reaction solution of (2) in sequence: 5.0 μL yeast tRNA, 12.5 μL 7.5 M NH4Oac, 70 μL anhydrous ethanol (−20° C.). Immediately after vortex mixing uniformly, centrifugation was carried out at 14000 for 20 min. (4) The precipitate was washed with 70% ethanol (−20° C.), dried at 37° C. and dissolved to 4 μL. (5) 2 μL was electroporated into 50 μL E. coli K12 MC1061. The quality of the library was identified by a PCR method, with a forward primer: 5′TCGACCCACGCGTCCG 3′ (designed based on the sequence of the Sal I adaptor) and a reverse primer: 5′ GAGCGGCCGCCCT15 3′ (designed based on the sequence of the NotI primer-adaptor).

5X T₄ DNA ligase buffer 4 μL pSPORT1, Not I-Sal I-Cut (50 ng/μL) 1 μL cDNA(3 ng/μL) 4 μL T₄DNA ligase 1 μL Total volume with ddH₂O addition 20 μL 

I: cDNA Library Screening with a Random Sequencing Strategy

3000 clones were selected randomly from the well-constructed cDNA library for the venom gland from Chaerilus tryznai Kovarik, and were sent to Shanghai Sciample Company for sequencing. The sequence input software was BioEdit v4.5.8 (Tom Hall, 1999), and the prediction softwares for homology comparison and signal peptide cleavage sites were CLUSTAL X 1.8 (Thompson et al., 1997) and PC/GENE (Intelligenetics Inc., Switzerland), respectively. Sequence analysis indicated that, the 2007^(th) clone was a novel antiseptic peptide gene, named Ctryamp, of which the sequence is the nucleotide sequence as set forth in SEQ ID NO: 3:

(FIG. 1) ttcctctgtgaaagtaagttctgtgaaactcactcttcgataaaatg aaatctcagacctttttccactttttctagttgttttattattagca atttcacaatcagaagcttttatcaggatcgccaggctcctcaggat ctttggaaaaagaagtatgagagatatggatactatgaaatacttat atgaaccaagtttgagtgcagctgacttgaaaaccttacaaaaacta atggaaaattactgattatttgaatataataatgttatctctatttt agattataaatatttcttttgaaaaaaaaaaaaaaaaaaaaa. A precursor organizational form of the Ctryamp encodes 68 amino acid residues consisting of three portions, that is, a signal peptide (23 residues), mature peptide (11 residues) and precursor peptide (34 residues). Therefore, the present invention provides an antiseptic peptide from Chaerilus tryznai Kovarik: FIRIARLLRIF (SEQ ID NO: 2).

Example 2 Structure Analysis of Ctryamp Polypeptide and the Structurally Homologous Amphiphilic Polypeptides Thereof

According to the sequence (FIRIARLLRIF) of the mature peptide of Ctryamp as set forth in SEQ ID NO: 2 as provided in EXAMPLE 1, the secondary structure of Ctryamp was predicted by using on-line NPS@ server [DSC method (Discrimination of protein Secondary structure Class)], and shown by software AHTHEPROT 2000. Results showed that, the Ctryamp contained 100% of α-Helix structure, had a typical amphiphilic α-Helix structure and comprised a large number of basic residues (Arg) with net positive charges. Based on the helix diagram of the polypeptide sequence, a large number of point mutations on the polypeptide sequence FIRIARLLRIF of Ctryamp were performed then. It was found that the sequence FIX₁IAX₂LLX₃IF (X₁, X₂ and X₃ independently are any one of three basic amino acids His, Arg and Lys) (SEQ ID NO: 1) did not influence its amphiphilic property (Table 1). Therefore, the present invention provides a group of structurally homologous polypeptides (SEQ ID NO: 1) of a Ctryamp polypeptide from Chaerilus tryznai Kovarik.

TABLE 1 Ctryamp polypeptide from Chaerilus tryznai Kovarik and structurally homologous polypeptides thereof Polypeptide Amino acid Position in the Mutation A helix name sequence Sequence listing property value Ctryamp FIKIARLLRIF SEQ ID NO: 2  Wild type 100% Ctryamp-R3K FIKIARLLRIF SEQ ID NO: 7  Basic 100% Ctryamp-R5K FIRIAKLLRIF SEQ ID NO: 8  Basic 100% Ctryamp-R9K FIRIARLLKIF SEQ ID NO: 9  Basic 100% Ctryamp-R3H FIHIARLLRIF SEQ ID NO: 10 Basic 100% Ctryamp-R5H FIRIAHLLRIF SEQ ID NO: 11 Basic 100% Ctryamp-R9H FIRIARLLHIF SEQ ID NO: 12 Basic 100% Ctryamp-1 FIKIAKLLRIF SEQ ID NO: 13 Basic 100% Ctryamp-2 FIKIARLLKIF SEQ ID NO: 14 Basic 100% Ctryamp-3 FIRIAKLLKIF SEQ ID NO: 15 Basic 100% Ctryamp-4 FIKIAKLLKIF SEQ ID NO: 16 Basic 100% Ctryamp-5 FIHIAHLLRIF SEQ ID NO: 17 Basic 100% Ctryamp-6 FIHIARLLHIF SEQ ID NO: 18 Basic 100% Ctryamp-7 FIHIAKLLRIF SEQ ID NO: 19 Basic 100% Ctryamp-8 FIRIAKLLHIF SEQ ID NO: 20 Basic 100%

Example 3 Polypeptide and the Structurally Homologous Amphiphilic Polypeptides Thereof

Artificial synthesis was carried out according to the amino acid sequence of the Ctryamp (FIRIARLLRIF) as provided in EXAMPLE 1 and that of the structurally homologous amphiphilic polypeptides thereof (FIX₁IAX₂LLX₃IF, as provided in EXAMPLE 2). A high-purity Ctryamp polypeptide (as shown in FIGS. 2 and 3) and structurally homologous amphiphilic polypeptides thereof were obtained by solid-phase chemical synthesis (Table 1).

Example 4 Bacteriostasis Experiment of Ctryamp Polypeptide and the Structurally Homologous Amphiphilic Polypeptides Thereof

Bacteriostasis Experiment on Gram-Negative Bacteria:

96-well plate culturing method: (1) When Pseudomonas aeruginosa (including a standard strain, clinically isolated strain and drug resistant strain), Escherichia coli (including standard strains CCTCC AB94012 and ATCC25922, a clinically isolated strain and drug resistant strain), Klebsiella pneumoniae, Serratia fonticola, Salmonella typhimurium, Shigella dysentery, Acinetobacter baumannii, Neisseria meningitidis, Neisseria gonorrhoeae, Bordetella pertussis and Haemophilus influenza were cultured to OD600=0.8, respectively, they were diluted in 400 times and 80 μl of each was added into a 96-well plate, and then added with 20 μl of the Ctryamp polypeptide and structurally homologous amphiphilic polypeptides thereof (as provided in EXAMPLE 2) which were diluted with equal ratios, respectively, reaching final concentrations of 100 μg/ml, 10 μg/ml, 1 μg/ml, 0.1 μg/ml. 20 μl of liquid medium and 20 μl of kanamycin were respectively added into a negative control and positive control well (with a final concentration of 20 μg/ml). (2) After culture at 37° C. for 12 hours, each well in the 96-well plate was detected for absorbance at 600 nm with a microplate reader. (3) After the minimum inhibitory concentration of the 10-fold diluted drug, that is, the Ctryamp polypeptide and structurally homologous amphiphilic polypeptides thereof were determined, the minimum inhibitory concentration was double diluted and the steps (1) and (2) were repeated, thereby finally determining the minimum inhibitory concentration against bacteria of the antiseptic Ctryamp polypeptide and structurally homologous amphiphilic polypeptides thereof.

For the Ctryamp polypeptide as provided in EXAMPLE 1, MIC against Pseudomonas aeruginosa was 8 μg/ml, MIC against Escherichia coli was 6.25-12.5 μg/ml, MIC against Klebsiella pneumoniae was 25 μg/ml, MIC against Serratia fonticola was 12.5 μg/ml, MIC against Salmonella typhimurium was 12.5 μg/ml, MIC against Shigella dysentery was 6.25 μg/ml, MIC against Acinetobacter baumannii was 6.25 μg/ml, MIC against Neisseria meningitidis was 6.25 μg/ml, MIC against Neisseria gonorrhoeae was 6.25 μg/ml, MIC against Bordetella pertussis was 3.13 μg/ml, and MIC against Haemophilus influenza was 3.13 μg/ml. MIC against Proteusbacillus vulgaris was 6.25 μg/ml.

Bacteriostasis Experimenton Gram-Positive Bacteria:

96-well plate culturing method: (1) When Staphylococcus aureus (including standard strains CCTCC AB94004 and ATCC25923, a clinically isolated strain), methicillin-sensitive coagulase-negative staphylococci (MSSCNS), Streptococcus hemolyticus (including a standard strain, clinically isolated strain and drug resistant strain), Enterococcus, Corynebacterium diphtherias, Corynebacterium acnes were cultured to OD600=0.8, respectively, they were diluted in 400 times and 80 μl of each was added into a 96-well plate, and then added with 20 μl of the Ctryamp polypeptide and structurally homologous amphiphilic polypeptides thereof (as provided in EXAMPLE 2), which were diluted with equal ratios, respectively, reaching final concentrations of 100 μg/ml, 10 μg/ml, 1 μg/ml, 0.1 μg/ml. 20 μl of liquid medium and 20 μl of penicillin were respectively added into a negative control and positive control well (with a final concentration of 50 μg/ml). (2) After culture at 37° C. for 12 hours, each well in the 96-well plate was detected for absorbance at 600 nm with a microplate reader. (3) After the minimum inhibitory concentration of the 10-fold diluted drug, that is, the Ctryamp polypeptide and structurally homologous amphiphilic polypeptides thereof were determined, the minimum inhibitory concentration was double diluted and the steps (1) and (2) were repeated, to finally determine the minimum inhibitory concentration against bacteria of the antiseptic Ctryamp polypeptide and structurally homologous amphiphilic polypeptides thereof.

For the Ctryamp polypeptide and structurally homologous amphiphilic polypeptides thereof, MIC against Staphylococcus aureus was 1.63-6.25 μg/ml, against methicillin-sensitive coagulase-negative staphylococci of the Ctryamp polypeptide was 3.13-12.5 μg/ml, against Streptococcus hemolyticus was 8-16 μg/ml, against Corynebacterium diphtherias was 3.13 μg/ml, against Corynebacterium acnes was 3.13 μg/ml, and against Enterococcus was 6.25 μg/ml.

Bacteriostasis Experiment on Methicillin-Resistant Staphylococcus:

Methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-resistant coagulase-negative staphylococci (MRSCNS): clinical strains were separated and obtained from Clinical Laboratory Center in People's Hospital of Jiangsu, Central South University.

96-well plate culturing method: (1) When methicillin-resistant Staphylococcus aureus and methicillin-resistant coagulase-negative staphylococci were cultured to OD600=0.8, respectively, they were diluted in 400 times and 80 μl of each was added into a 96-well plate, and then added with 20 μl of the Ctryamp polypeptide and structurally homologous amphiphilic polypeptides thereof (as provided in EXAMPLE 2) which were diluted with equal ratios, respectively, reaching final concentrations of 100 μg/ml, 10 μg/ml, 1 μg/ml, 0.1 μg/ml. 20 μl of liquid medium and 20 μl of vancomycin were respectively added into a negative control and positive control well (with a final concentration of 12 μg/ml). (2) After culture at 37° C. for 12 hours, each well in the 96-well plate was detected for absorbance at 600 nm with a microplate reader. (3) After the minimum inhibitory concentration of the 10-fold diluted drug of the Ctryamp polypeptide was determined, the minimum inhibitory concentration was double diluted and the steps (1) and (2) were repeated. The minimum inhibitory concentration of the antiseptic Ctryamp polypeptide against methicillin-resistant Staphylococcus aureus and methicillin-resistant coagulase-negative staphylococci was 3.13-12.5 μg/ml or 4-8 μg/ml (Test results from the third party).

Bacteriostasis Experiment on Anaerobic Bacterium:

96-well plate culturing method: (1) When Clostridium tetani, Clostridium perfringens, Bacteroides fragilis were cultured to OD600=0.8, respectively, they were diluted in 400 times and 80 μl of each was added into a 96-well plate, and then added with 20 μl of the Ctryamp polypeptide as provided in EXAMPLE 1 which was diluted with equal ratios, respectively, reaching final concentrations of 100 μg/ml, 10 μg/ml, 1 μg/ml, 0.1 μg/ml. 20 μl of liquid medium and 20 μl of penicillin were respectively added into a negative control and positive control well (with a final concentration of 400 μg/ml). (2) After culture at 37° C. for 12 hours, each well in the 96-well plate was detected for absorbance at 600 nm with a microplate reader. (3) After the minimum inhibitory concentration of the 10-fold diluted drug, that is, the Ctryamp polypeptide and structurally homologous amphiphilic polypeptides thereof was determined, the minimum inhibitory concentration was double diluted and the steps (1) and (2) were repeated, thereby finally determining the minimum inhibitory concentration against bacteria of the antiseptic Ctryamp polypeptide.

For the Ctryamp polypeptide, MIC against Clostridium tetani was 25 μg/ml, against Clostridium perfringens was 25 μg/ml, and against Bacteroides fragilis was 12.5 μg/ml.

Results of the antiseptic tests are shown in Tables 2, 3 and 4.

TABLE 2 Minimum inhibitory concentration MIC (μg/ml) of Ctryamp polypeptide from Chaerilus tryznai Kovarik and the structurally homologous polypeptides thereof against standard Escherichia coli and Staphylococcus aureus Polypeptide Amino acid Escherichia Staphylococcus name sequence coli aureus Ctryamp FIRIARLLRIF 12.5   6.25 Ctryamp-R3K FIKIARLLRIF 12.25  6.25 Ctryamp-R5K FIRIAKLLRIF  6.25  6.25 Ctryamp-R9K FIRIARLLKIF 12.5   6.25 Ctryamp-R3H FIHIARLLRIF  6.25  6.25 Ctryamp-R5H FIRIAHLLRIF 12.5   6.25 Ctryamp-R9H FIRIARLLHIF  6.25  6.25 Ctryamp-1 FIKIAKLLRIF  6.25  6.25 Ctryamp-2 FIKIARLLKIF  6.25 12.5  Ctryamp-3 FIKIAKLLKIF 12.5   6.25 Ctryamp-4 FIKIAKLLKIF  6.25 12.5  Ctryamp-5 FIHIAHLLRIF  6.25 12.5  Ctryamp-6 FIHIARLLHIF  6.25  6.25 Ctryamp-7 FIHIAKLLRIF 12.5   6.25 Ctryamp-8 FIRIAKLLHIF 12.5   6.25

TABLE 3 The inhibitory effect of Ctryamp polypeptide from Chaerilus tryznai Kovarik on gram-negative and positive bacteria, anaerobic bacterium and clinically drug-resistant bacteria Minimum inhibitory Number of concentration Bacterial experimental MIC (family) genus Experimental bacteria Nature strains (μg/ml) Staphylococcus S. aureus (standard strain ATCC25923) G⁺ 1 6.25 S. aureus (clinically isolated strain) G⁺ 17 1.63-6.25 Methicillin-resistant S. aureus (MRSA) G⁺ 5 3.13-12.5 ★S. aureus ATCC 29213 G⁺ 1 8 ★Methicillin-resistant S. aureus (MRSA) G⁺ 11 4-8 ★methicillin-resistant coagulase-negative G⁺ 11 4 staphylococci (MRSCNS) ★methicillin-sensitive coagulase-negative G⁺ 5 4 staphylococci (MSSCNS) Streptococcus S. pneumoniae G⁺ 1 3.13 S. agalactiae G⁺ 1 25 ★Streptococcus ATCC 19615 (standard G⁺ 1 8 strain) ★Erythromycin-sensitive S. pyogenes G⁺ 4 16 (β-hemolytic streptococcus) ★Erythromycin-resistant S. pyogenes G+ 11  8-16 Enterococcus E. faecium G⁺ 1 25 E. faecalis G⁺ 1 50 Neisseria N. meningitidis G⁻ 1 6.25 N. gonorrhoeae G⁻ 1 6.25 Escherichia E. coli ATCC25922 (standard strain) G⁻ 1 6.25 E. coli (clinically isolated strain) G⁻ 8 6.25-12.5 ★ATCC25922 (non-ESBLs-producing) G− 1 4 ★ATCC35218 (ESBLs-producing) G⁻ 1 4 ★ESBLs-producing E. coli G− 10 4-8 ★non-ESBLs-producing E. coli G− 4 4-8 dysentery bacilli G⁻ 1 6.5 Salmonella G⁻ 1 12.5 K. peneumoniae G⁻ 1 25 K. oxytoca G⁻ 1 12.5 Citrobacter G⁻ 1 12.5 E. cloacae G⁻ 1 12.5 S. fonticola G⁻ 1 12.5 Anaerobic C. tetani G⁺ 1 25 bacteria C. perfrimgens G⁺ 1 25 Bacteroides fragilis G⁺ 1 12.5 Corynebacterium C. dipheriae G⁺ 1 3.13 C. acnes G⁺ 1 3.13 Pseudomonas ★P. aeruginosa ATCC27853 (standard G− 1 8 strain) ★P. aeruginosa (IPM-S strain) G− 4  8-16 ★P. aeruginosa (IPM-R strain) G− 8  8-16 Acinetobacter A. baumanii (clinically isolated strain) G⁻ 2 12.5 Bordetella B. pertussis G⁻ 1 3.13 Haemophilus H. influenzae G⁻ 1 3.13 Mycobacterium ★M. tuberculosis G⁺ 1 25 Note: ★indicates that the test result for the minimum inhibitory concentration was carried out by the third party.

Example 4 Preparation of the Ctryamp Polypeptide Antiseptic Formulations

1) Formulation: 0.01-1.5 g of the antiseptic polypeptide Ctryamp from Chaerilus tryznai Kovarik prepared in EXAMPLE 1, 5 g of glycerol, 7 g of hydroxypropylmethyl cellulose, 0.1 g of glycolic acid, 0.1 g of EDTA, added with sterilized water up to 100 g.

2) Preparation: The hydroxypropylmethylcellulose was sprayed onto the liquid surface (about 60 mL) to form a matrix for gel overnight, and then the matrix was de-foamed under vacuum after standing. The glycolic acid was mixed uniformly with other drug substances, and gradually added into slurry with mixing uniformly, during which vigorous agitation was avoided to prevent mixing of excess bubbles. It was subpackaged to obtain an antiseptic gel formulation.

3) Blank control gel formulation: The formulation had the same formulation and its preparation was the same as the above preparation, except containing no Ctryamp polypeptide.

Note that: HydroxypropylMethyl Cellulose (HPMC). Glycerol, Hydroxypropyl Methyl Cellulose, glycolic acid and EDTA were all of medicinal specifications.

Example 5 Inhibitory Effect of the Ctryamp Polypeptide Antiseptic Formulation on Standard Escherichia coli, Staphylococcus aureus, MRSA and Pseudomonas aeruginosa

1) The finished gel formulation provided in EXAMPLE 4 was dissolved in sterilized normal saline at a ratio of 1:49, and was diluted with an equal ratio to 10 concentrations and placed in a 4° C. water tank.

2) The standard Escherichia coli, Staphylococcus aureus, MRSA and Pseudomonas aeruginosa were inoculated in LB medium with breed conservation, and cultured at 37° C. overnight.

3) The bacterial solution which had been cultured overnight was diluted to OD600=0.002 with fresh LB medium.

4) 80 μL of the above bacterial solution was added into each well in a 96-well plate.

5) 20 μL of the finished gel solution at different concentrations was added into the bacterial solution.

6) Negative control tests of the gel and normal saline as well as positive control tests of the raw material polypeptide and antibiotic were performed at the same time.

7) The 96-well plate was placed in an oscillator at 37° C. and 250 rpm to be cultured for 16 hours.

8) The 96-well plate was taken out after 16 hours, cooled to room temperature and placed onto a microplate reader to determine its absorbance at 630 nm.

9) The concentration of the solution completely without any light absorption was used as the minimum inhibitory concentration.

10) Antibacterial results showed that, the antiseptic formulation had potent inhibitory effect on the standard Escherichia coli, Staphylococcus aureus, MRSA and Pseudomonas aeruginosa. The formulation had a minimum inhibitory concentration MIC against Escherichia coli, Staphylococcus aureus of 6.25 μg/mL (calculated based on the active ingredient polypeptide in this formulation), thus had an identical minimum inhibitory concentration to the raw material polypeptide (the raw material Ctryamp and synthesized structurally homologous amphiphilic polypeptides thereof have a MIC against Escherichia coli, Staphylococcus aureus of 6.25 μg/mL). The formulation had a minimum inhibitory concentration MIC against MRSA of 6.25 μg/mL, and against Pseudomonas aeruginosa of 8 μg/mL (the raw material Ctryamp and synthesized structurally homologous amphiphilic polypeptides thereof have a MIC against MRSA and Pseudomonas aeruginosa of 6.25 μg/mL and 8 μg/mL, respectively). Whereas, the control formulation had no antiseptic activity.

Results of the antiseptic tests are shown in Table 4.

TABLE 4 The minimum inhibitory concentration (MIC) of Ctryamp polypeptide topical gel formulation from Chaerilus tryznai Kovarik against gram-negative, gram-positive bacteria and drug resistant bacteria Minimum inhibitory Tested bacterial strain concentration MIC E. coli 6.25 E. coli 6.25 S. aureus 6.25 S. aureus 6.25 Methicillin-resistant S. aureus (MRSA) 6.25 P. aeruginosa (clinically isolated strain) 8 C. perfrimgens 25 Note: Calculated based on the active ingredient, i.e., Ctryamp polypeptide or the structurally homologous polypeptides thereof in the formulation

Example 6 A Clinical Trial of the Ctryamp Polypeptide Antiseptic Formulation on the Treatment of Patients with Wound Surface Bacterial Infections

1) General information of cases: in 82 patients in a treatment group, with 38 males and 44 females; aged from minimum 4 to maximum 76; disease classification: 28 cases with bruised wound surface, 12 cases with small-sized scald wound surface, 10 cases with residual burn wound surface, 12 cases with chronic ulcer affected by type 2 diabetic, 12 cases in perioperative period of a flap operation, and 8 cases after wide-range laser treatment for face. In 74 patients in a control group, with 36 males and 38 females; aged from minimum 5 to maximum 78; disease classification: 28 cases with bruised wound surface, 13 cases with small-sized scald wound surface, 10 cases with residual burn wound surface, 8 cases with chronic ulcer affected by type 2 diabetic, 10 cases in perioperative period of a flap operation, and 5 cases after laser treatment.

2) Treatment method in the experimental group: The topical Ctryamp polypeptide gel provided in EXAMPLE 4 (abbreviated as scorpion peptide antiseptic gel) was administered topically. All the wound or ulcer surfaces were applied with the scorpion peptide antiseptic gel to a thickness of about 1-2 mm, once every day; alternatively, the wound surfaces were covered with gauzes infiltrated with the scorpion peptide antiseptic gel, with drug replacement once every 3 days. Bruised wound surface and superficial II degree scald wound surface were all rinsed with 3% hydrogen peroxide solution, followed with sterilized normal saline until the wound surface was clean. After the necrotic tissues were removed, the wound surface was rinsed with sterilized normal saline again and surrounding skin was disinfected with 0.2% povidone iodine. After the wound surface was dried with sterile cotton balls, the scorpion peptide antiseptic gel was evenly coated onto the wound surface in a thickness of about 1-2 mm. Samples from the residual burn wound surface and chronic ulcer affected by type 2 diabetic were taken for bacterial culture, in order to observe the wound surface infections. After the wound surface was cleaned using the abovementioned method, the scorpion peptide antiseptic gel was coated evenly onto the wound surface. When granulation tissues have grown, skin was grafted punctiformly and then coated evenly with the scorpion peptide antiseptic gel in a thickness of about 1-2 mm, then covered with mesh gauzes and dressed under pressure, with the first dressing replacement in 3 days. For patients with chronic diabetes, long-term blood glucose was monitored to achieve near normal level, best with the Fasting plasma glucose (FPG) below 8 mmol/L. During the perioperative period of a flap operation, after the wound was cleaned, the scorpion peptide antiseptic gel was directly coated onto the wound surface for protection in a thickness of 1-2 mm. For the laser treatment, the wound surface was washed with normal saline and then directly coated with the scorpion peptide antiseptic gel in a thickness of 1-2 mm.

3) Treatment method in the control group: All the wounds or ulcer surfaces were cleaned, dressed with gauzes and treated with semi-exposure after 3 days while keeping the wound surfaces dry.

4) Efficacy results and comparison: 82 patients in the treatment group experienced surface healing in the first phase, without any infections and delayed healing of the wound surface, and without any allergic reactions or other adverse reactions. Efficacy was determined in accordance with the Antibacterial Drug Clinical Trial Guiding Principles issued by the National Ministry of Health in 2007. Results showed that in the 82 cases of the treatment group, 80 cases were significantly effective and 2 cases were effective, giving an effective rate of 100%. In the 74 cases of the control group, 50 cases were significantly effective, 20 cases were effective and 4 cases were ineffective, giving an effective rate of 95%. Statistical F-test for the two groups showed P<0.05. Comparison of the time for promotion of wound surface healing in both the groups is shown in Table 1. Statistical F-test showed P<0.05 (Table 5). Clinical treatment results showed that the topical gel provided in the present invention can effectively prevent and treat bacterial infections, and meanwhile can significantly promote wound repair and healing. The scorpion peptide antiseptic gel had potent bacterial inhibitory effect on MRSA and imipenem-resistant Pseudomonas aeruginosa (IPM-R strain), and had an uniquely efficient treatment for the superficial chronic refractory infection wound surface (in the 82 cases of the treatment group, 8 cases of bacterial cultures were infected with MRSA and 5 cases were infected with Pseudomonas aeruginosa IPM-R strains, which were both effectively treated with the scorpion peptide antiseptic gel).

TABLE 5 Average healing time of scorpion peptide antiseptic gel and conventional dressing change and comparisons therebetween* Healing time Average healing time Group Cases (days) (days) Scorpion peptide 82 5-20 12.14 ± 2.96 antiseptic gel Conventional 74 7-28 18.85 ± 2.78 dressing change *For comparison between the two groups, P < 0.05.

Example 7 Clinical Trials of the Polypeptide Antiseptic Formulations on the Treatment of Patients with Acne

1) Case selection: The selected patients were all from Dermatology Clinic in People's Hospital of Wuhan University, which were acne patients confirmed clinically. Ones who had an allergic history to clindamycin or quinolones, had taken other anti-acne drugs in 15 days, and suffered from serious severe hepatic and renal dysfunction, as well as pregnant women and lactating women were excluded.

2) Groups of experiments: 258 patients were divided into an experimental group and a control group by using multi-center and open parallel control observation. Experimental group: 168 cases, with 76 males and 92 females, aged from 20 to 38. Control group: 90 cases, with 46 males and 44 females, aged from 22 to 39. The experimental group and control group were comparable in that there was no significant difference in various index values such as the age, sex, stage of disease and degree of skin damages between them.

3) Experimental method: The experimental group was topically administered with the medicament for treating acne of the topical Ctryamp polypeptide gel as provided in EXAMPLE 4. The control group was topically administered with 5% Sulfur Cream (prepared in the Drug manufacturing room in People's Hospital of Wuhan University). Administration method: The face was washed with warm water and liquid soap or sulfur soap to completely remove the facial oil and dirty. Then the medicament was dipped with a finger to be gently coated onto the wound repeatedly, once each morning and evening, with one course of treatment being continuous 2 weeks.

4) Efficacy observation and judgment criterion: 258 participators were visited once every week, and during return visit, tables for observation were filled in detail to record the number, change and adverse reaction of skin damages in facial acne of the patients. The efficacy statistics were based on the total percentage of reduction of various damages (comedo, inflammatory scars, abscesses, nodules, cystides) in acne. Healing: 100% of extinction of skin damages; significant: 76-99% of extinction of skin damages; effective: 50-70% of extinction of skin damages; ineffective: <50% of extinction of skin damages. At the end of the course of treatment, acne percentage after the treatment was calculated by a metering method to evaluate the efficacy. Meanwhile, adverse reactions were observed to determine whether there was local stimulation and systemic symptoms, and for a part of patients, examinations on routine blood and urine, and liver and kidney function were performed before and after the clinical trials

5) Statistical analysis compared with the control: In the 168 cases of the experimental group, 112 cases were healed, accounting for 66.7%; 51 cases were significant, accounting for 30.4%; 5 cases were effective, accounting for 2.98%; no case was ineffective, accounting for 0%, with a total effective rate of 100%. In the 90 cases of the control group, 5 cases were healed, accounting for 5.6%; 14 cases were significant, accounting for 15.6%; 20 cases were effective, accounting for 22.2%; and 51 cases were ineffective, accounting for 4%, with a total effective rate of 43%. By analysizing the efficiency, there was significant difference between the experimental group and control group, suggesting the efficacy on acne treatment in the experimental group is superior to the control group.

6) Adverse reactions: There was no adverse reaction in any of the 168 patients in the experimental group. Of the 90 patients in the control group, 5 cases had local burning sensation and flushing, which were self relieved after stopping drug administration without any treatment. In addition, in the experimental group, totally, the routine blood and urine in 10 cases, liver function in 16 cases and kidney function in 8 cases were examined before and after the treatment, no abnormal change was observed.

Example 8 Clinical Trials of the Ctryamp Polypeptide Antiseptic Formulation on the Treatment of Patients with Eczema

22 patients with chronic eczema were treated with the topical polypeptide antiseptic gel formulation as provided in EXAMPLE 4 in the Burn and Plastic Surgery Unit of the People's Hospital of Hubei Province, once every day. 19 cases in the control group were treated with 1% hydrocortisone cream externally, twice every day. The clinical observation time was 2 weeks. Experimental results showed that, the scorpion peptide antiseptic gel had unique curative effect on eczema with a curative rate of 100%, and with no relapse during clinical follow-up visits; whereas in the control group, clinical symptoms were reduced but there were severe relapses during follow-up visits.

Example 9 Bacteriostasis Experiment on Ctryamp Polypeptide Mutants

Experimental Materials:

Ctryamp polypeptide mutants: Each Ctryamp polypeptide mutant has the amino acid sequence as set forth in SEQ ID NOs: 21 to 52 in the SEQUENCE LISTING, and the mutation type thereof is shown in Table 6. All these Ctryamp polypeptide mutants were synthesized by GL Biochem Ltd.

Standard strains: Staphylococcus aureus (RA) ATCC25923 and Escherichia coli (E. coli) ATCC25922; ampicillin (Amp).

MH medium: beef powder 2.0 g, soluble starch 1.5 g, acid hydrolyzed casein 17.5 g, pure water 1 L. The MH medium was autoclaved at 121° C. for 20 min for use.

Experimental Method:

(1) Inoculation: 10 μL of standard strains of Staphylococcus aureus (RA) ATCC25923 and Escherichia coli (E. coli) ATCC25922 were inoculated into 10 mL MH medium respectively and cultured overnight for 16 hours at 37° C. and 250 rpm.

(2) Transferred inoculation: 100 μL resulted bacterial solutions of the standard strains of Staphylococcus aureus (RA) ATCC25923 and Escherichia coli (E. coli) ATCC25922 cultured overnight were transferred respectively into 10 mL of fresh MH medium and cultured at 37° C. and 250 rpm for 2 hours.

(3) Dilution of bacterial solution: The bacterial solutions of the standard strains of Staphylococcus aureus (RA) ATCC25923 and Escherichia coli (E. coli) ATCC25922 obtained in (2) were taken separately to determine their OD₆₀₀ values, they were diluted with MH medium to OD₆₀₀=0.002 respectively.

(4) Sample application: 100 μL of MH medium was added into the periphery of a sterile 96-well plate as a guard circle; each well inside the guard circle was added with 80 μL of the diluted bacterial solution obtained in step (3); and then the wells with the bacterial solution inside the guard circle were added with 20 μL of a formulated solution of the Ctryamp polypeptide mutants, with a sequence ranging from a low concentration to a high concentration, each concentration was repeated in 3 wells. 20 μL of 20 mg/mL ampicillin was used as a positive control and 20 μL of sterile water was used as a negative control.

(5) Culture: The 96-well plated obtained in step (4) was placed on an oscillator at 37° C. and 250 rpm for 16 hours.

(6) Detection: After cultured for 16 hours, the 96-well plate was taken out to observe the bacterial growth therein and record experimental results, with the corresponding sample concentration (concentration of the Ctryamp polypeptide mutant) in a well where there was no bacterial growth as a minimum inhibitory concentration (MIC) against the bacterium.

Experimental Results:

Experimental results of the inhibitory effect of each Ctryamp polypeptide mutant on the standard strains of Staphylococcus aureus (RA) ATCC25923 and Escherichia coli (E. coli) ATCC25922 are shown in Table 7.

TABLE 6 The information of the amino acid sequences of Ctryamp polypeptide mutants and mutation types Position Ctryamp in polypeptide Amino acid Sequence Mutation mutant sequence Listing type Ctryamp FIRIARLLEIF SEQ ID Single-point polypeptide NO: 21 mutation mutant 1 (substitution) Ctryamp FIRIADLLRIF SEQ ID Single-point polypeptide NO: 22 mutation mutant 2 (substitution) Ctryamp FIRIAKLLKIF SEQ ID Two-point polypeptide NO: 23 mutation mutant 3 (substituted) Ctryamp FIKIARLLKIF SEQ ID Two-point polypeptide NO: 24 mutation mutant 4 (substituted) Ctryamp FIKIAKLLKIF SEQ ID Three-point polypeptide NO: 25 mutation mutant 5 (substituted) Ctryamp FIKIGKLLKIF SEQ ID Four-point polypeptide NO: 26 mutation mutant 6 (substituted) Ctryamp FIKIGKILKIF SEQ ID Five-point polypeptide NO: 27 mutation mutant 7 (substituted) Ctryamp FIRIARLRIF SEQ ID 1 amino acid polypeptide NO: 28 deleted mutant 8 Ctryamp  FRIARLLRIF SEQ ID 1 amino acid polypeptide NO: 29 deleted mutant 9 Ctryamp FIRARLLRIF SEQ ID 1 amino acid polypeptide NO: 30 deleted mutant 10 Ctryamp FIRIARLLIF SEQ ID 1 amino acid polypeptide NO: 31 deleted mutant 11 Ctryamp FIRRLLRIF SEQ ID 2 amino acids polypeptide NO: 32 deleted mutant 12 Ctryamp FIRRLRIF SEQ ID 3 amino acids polypeptide NO: 33 deleted mutant 13 Ctryamp FIRLRIF SEQ ID 4 amino acids polypeptide NO: 34 deleted mutant 14 Ctryamp RLLRIF SEQ ID 5 amino acids polypeptide NO: 35 deleted mutant 15 Ctryamp GFIRIARLLRIF SEQ ID 1 amino acid polypeptide NO: 36 added mutant 16 Ctryamp FIRIARLLRKIF SEQ ID 1 amino acid polypeptide NO: 37 added mutant 17 Ctryamp FIRIARLLKRIF SEQ ID 1 amino acid polypeptide NO: 38 added mutant 18 Ctryamp FIRKIARLLRIF SEQ ID 1 amino acid polypeptide NO: 39 added mutant 19 Ctryamp FIKRIARLLRIF SEQ ID 1 amino acid polypeptide NO: 40 added mutant 20 Ctryamp FFIRIARLLRIF SEQ ID 1 amino acid polypeptide NO: 41 added mutant 21 Ctryamp IFFIRIARLLRIF SEQ ID 2 amino acids polypeptide NO: 42 added mutant 22 Ctryamp RIFFIRIARLLRI SEQ ID 3 amino acids polypeptide F NO: 43 added mutant 23 Ctryamp LRIFFIRIARLLR SEQ ID 4 amino acids polypeptide IF NO: 44 added mutant 24 Ctryamp LLRIFFIRIARLL SEQ ID 5 amino acids polypeptide RIF NO: 45 added mutant 25 Ctryamp RLLRIFFIRIARL SEQ ID 6 amino acids polypeptide LRIF NO: 46 added mutant 26 Ctryamp ARLLRIFFIRIAR SEQ ID 7 amino acids polypeptide LLRIF NO: 47 added mutant 27 Ctryamp IARLLRIFFIRIA SEQ ID 8 amino acids polypeptide RLLRIF NO: 48 added mutant 28 Ctryamp RIARLLRIFFIRI SEQ ID 9 amino acids polypeptide ARLLRIF NO: 49 added mutant 29 Ctryamp IRIARLLRIFFIR SEQ ID 10 amino acids polypeptide IARLLRIF NO: 50 added mutant 30 Ctryamp FIRIARLLRIFFI SEQ ID 11 amino acids polypeptide RIARLLRIF NO: 51 added mutant 31 Ctryamp Ac-FIRIARLLRI SEQ ID Acetylation of polypeptide F NO: 52 Phe residue at mutant 32 N terminal Note: The amino acid sequence “Ac-FIRIARLLRIF” which the Ctryamp polypeptide mutant 32 corresponds to represents that the amino group on Phe residue at the N terminal of “FIRIARLLRIF” is modified with an acetyl group.

TABLE 7 Minimum inhibitory concentration of Ctryamp polypeptide mutant against standard strains of Staphylococcus aureus (RA) ATCC25923 and Escherichia coli (E. coli) ATCC25922 MIC (μg/mL) Staphylococcus Escherichia coli aureus (RA) (E. Coli) Ctryamp polypeptide mutant ATCC25923 ATCC25922 Ctryamp polypeptide mutant 1 >25 >25 Ctryamp polypeptide mutant 2 25 >25 Ctryamp polypeptide mutant 3 12.5 12.5 Ctryamp polypeptide mutant 4 12.5 12.5 Ctryamp polypeptide mutant 5 25 12.5 Ctryamp polypeptide mutant 6 25 12.5 Ctryamp polypeptide mutant 7 >25 12.5 Ctryamp polypeptide mutant 8 25 12.5 Ctryamp polypeptide mutant 9 12.5 6.25 Ctryamp polypeptide mutant 10 >25 >25 Ctryamp polypeptide mutant 11 >25 >25 Ctryamp polypeptide mutant 12 12.5 25 Ctryamp polypeptide mutant 13 >25 >25 Ctryamp polypeptide mutant 14 >25 >25 Ctryamp polypeptide mutant 15 >25 >25 Ctryamp polypeptide mutant 16 6.25 6.25 Ctryamp polypeptide mutant 17 6.25 12.5 Ctryamp polypeptide mutant 18 6.25 12.5 Ctryamp polypeptide mutant 19 6.25 6.25 Ctryamp polypeptide mutant 20 6.25 6.25 Ctryamp polypeptide mutant 21 12.5 25 Ctryamp polypeptide mutant 22 12.5 >25 Ctryamp polypeptide mutant 23 12.5 12.5 Ctryamp polypeptide mutant 24 25 >25 Ctryamp polypeptide mutant 25 25 >25 Ctryamp polypeptide mutant 26 >25 >25 Ctryamp polypeptide mutant 27 >25 >25 Ctryamp polypeptide mutant 28 >25 >25 Ctryamp polypeptide mutant 29 >25 >25 Ctryamp polypeptide mutant 30 >25 >25 Ctryamp polypeptide mutant 31 >25 >25 Ctryamp polypeptide mutant 32 6.25 25 Note: MIC > 25 μg/mL of the Ctryamp polypeptide mutant indicates MIC is greater than or equal to 50 μg/mL, and indicates weak or no antiseptic activity, that is, no clinical application value.

From the experimental results in Table 7, the Ctryamp polypeptide mutants 2 to 9, 12, 16 to 25 and 32 all had significant inhibitory effect against Staphylococcus aureus (RA) ATCC25923 and/or Escherichia coli (E. coli) ATCC25922. The Ctryamp polypeptide mutants 1, 10, 11, 13, 14, 15 and 26 to 31 had weak (MIC>25 μg/mL) or no inhibitory activity against Staphylococcus aureus and Escherichia coli.

The experimental results indicate that, after the polypeptide having the amino acid sequence as set forth in SEQ ID NO: 1 is subjected to the substitution, deletion, addition or modification of one or more amino acids, some still have biological activity while some have weak or no antiseptic activity.

For the Ctryamp polypeptide mutants remaining the antiseptic activity, when the polypeptide having the amino acid sequence as set forth in SEQ ID NO: 1 was subjected to the substitution of 1, 2, 3, 4 or 5 amino acids and the number of the substitution amino acid is 1, the polypeptides not having the amino acid sequence of SEQ ID NO: 21 would still have the antiseptic activity; when the polypeptide having the amino acid sequence as set forth in SEQ ID NO: 1 was subjected to the deletion of 1 or 2 amino acids, and when 1 amino acid was deleted, the deleted amino acid residue is not at position 4 or 9, the polypeptides not having the amino acid sequence of SEQ ID NO: 30 or SEQ ID NO: 31 would still have the antiseptic activity; when the polypeptide having the amino acid sequence as set forth in SEQ ID NO: 1 was subjected to the addition of 1-5 amino acids at its N terminal, the polypeptides would still have the antiseptic activity; and after the Ctryamp polypeptide mutants were subjected to the modification of amidation, phosphorylation, methylation, acetylation, ubiquitination, glycosylation or carbonylation, the polypeptides would still have the antiseptic activity; for example, when the Phe residue at the N terminal of the Ctryamp polypeptide was modified with acetylation, the formed mutant 32 having the amino acid sequence as set forth in SEQ ID NO: 52 would still have the antiseptic activity.

For the Ctryamp polypeptide mutants having weak or no antiseptic activity, when the amino acid sequence as set forth in SEQ ID NO: 1 was substituted with a single amino acid, the polypeptide having the amino acid sequence as set forth in SEQ ID NO: 21 had no antiseptic activity. When the amino acid sequence as set forth in SEQ ID NO: 1 was deleted with 3, 4 or 5 amino acids, the biological activity thereof would be influenced. When the polypeptide was deleted with a single amino acid, the deleted amino acid residue should not be at position 4 or 9, and the polypeptide should not have the amino acid sequence as set forth in SEQ ID NO: 30 or SEQ ID NO: 31. When the polypeptide having the amino acid sequence as set forth in SEQ ID NO: 1 was added with 6-11 amino acids at its N terminal, the biological activity thereof would be influenced.

Comparative Example 1 Inhibitory Activity of Existing Polypeptides

The polypeptides of amino acid sequences as set forth in SEQ ID NO: 2 and SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6 were compared for their antiseptic activity, and the results are shown in Table 8. It was found that although all these 4 polypeptides could effectively inhibit Staphylococcus aureus, ABP-W1 (SEQ ID NO: 4) and BmKAMP1 (SEQ ID NO: 5) had no inhibitory effect on gram-negative bacteria (MIC was 50 μg/mL), such as Escherichia coli, Pseudomonas aeruginosa and the like. The BmKAMP1-M (SEQ ID NO: 6) had relatively good inhibitory effect on Escherichia coli but had poor inhibitory effect on clinically common Pseudomonas aeruginosa (MIC was 50 μg/mL), which did not have any clinical application value. However, the Ctryamp polypeptide (SEQ ID NO: 2) had the broadest antiseptic spectrum. It not only had strong antiseptic activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, but also had high antiseptic activity against several gram-negative bacteria, gram-positive bacteria and specific infection pathogenic bacteria. This showed a significantly different clinical application value from SEQ ID NO: 4, SEQ ID NO: 5 and SEQ ID NO: 6. Meanwhile, it was also found in the present invention that, the Ctryamp polypeptide (SEQ ID NO: 2) also had unique curative effect on eczema.

It follows that, the polypeptide having the amino acid sequence as set forth in SEQ ID NO: 1, as well as the derived polypeptides having the amino acid sequences obtained by the modification, substitution, deletion or addition of one or more amino acids to the sequence of SEQ ID NO: 1, have the properties of high antiseptic activity and broad antiseptic spectrum. They have inhibitory effect with high activity on various bacteria (pathogenic bacteria) and also have uniquely effective effect on the prevention and treatment of infections caused by gram-positive bacteria, gran-negative bacteria and various drug resistant bacteria, and on the prevention and treatment of specific infections (infectious diseases) caused by specific pathogenic bacteria and eczema.

TABLE 8 Comparison of minimum inhibitory concentration for existing polypeptides Minimum inhibitory concentration MIC (μg/mL) Ctryamp ABP-W1 BmKAMP1 BmKAMP1-M Bacteria name (SEQ ID NO: 2) (SEQ ID NO: 4) (SEQ ID NO: 5) (SEQ ID NO: 6) Staphylococcus aureus 1.63-6.25 3.13 3.13 12.5 (methicillin-sensitive) Methicillin-resistant 6.25 8 12.5 6.25 Staphylococcus aureus Escherichia coli 6.25 >100 >100 12.5 Pseudomonas aeruginosa 8 >100 >100 50 Corynebacterium diphtheriae 3.13 / / / Acinetobacter baumannii 12.5 / / / Klebsiella pneumoniae 25 / / / Serratia fonticola 12.5 / / / Clostridium perfringens 25 / / / Salmonella 12.5 / / / Shigella 6.25 / / / Citrobacter 12.5 / / / Klebsiella oxytoca 12.5 / / / Bordetella pertussis 3.13 / / / Streptococcus pneumoniae 3.13 / / / Enterococcus faecium 25 / / / Streptococcus agalactiae 25 / / / Enterobacter cloacae 12.5 / / / Neisseria meningitidis 6.25 / / / Neisseria gonorrhoeae 6.25 / / / Clostridium tetani 25 / / / Corynebacterium acnes 3.13 / / / Haemophilus influenzae 3.13 / / / Mycobacterium tuberculosis 25 / / / “/” indicates it is not found.

The foregoing are only preferred modes of the present invention, and it is to be indicated that, for those skilled in the art, various improvements and modifications can be made without departing from the principles of the present invention, which shall be also deemed to fall within the protection scope of the present invention. 

1. A polypeptide characterized in having any one of the amino acid sequences as set forth in (I) and (II): (I) the amino acid sequence as set forth in SEQ ID NO: 1; (II) amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids.
 2. The polypeptide of claim 1, characterized in that, the modification includes amidation, phosphorylation, methylation, acetylation, ubiquitination, glycosylation or carbonylation; the substitution is substitution of 1, 2, 3, 4 or 5 amino acids; the deletion is deletion of 1, 2, 3, 4 or 5 amino acids; and/or the addition is addition of 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acids. 3-5. (canceled)
 6. The polypeptide of claim 1, characterized in that, the polypeptide does not have the amino acid sequence as set forth in SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, or SEQ ID NO: 53 or SEQ ID NO:
 54. 7. The polypeptide of claim 1, characterized in that, the polypeptide has an amino aide sequence as set forth in any one of SEQ ID NO: 2, SEQ ID NOs: 22 to 29, SEQ ID NO: 32, SEQ ID NOs: 36 to 45, or SEQ ID NO:
 52. 8-12. (canceled)
 13. A method for the improvement of condition in a subject comprising administering the polypeptide of claim 1 to the subject, wherein the improvement of condition is selected from the group consisting of: the inhibition of bacteria; the prevention and/or treatment of a bacterial infection disease and/or eczema; the promotion of tissue repair and/or wound healing; and the treatment of a burn injury, cold injury, crush injury, war injury, animal bite, nuclear radiation injury or combined injury.
 14. The method of claim 13, characterized in that, the bacterium is a gram-positive bacterium and/or gram-negative bacterium.
 15. The method of claim 14, characterized in that, the gram-positive bacterium belongs to Staphylococcus, Streptococcus, Enterococcus, Mycobacterium, anaerobic bacterium or Corynebacterium; and/or the gram-negative bacterium belongs to Neisseria, Enterobacteriaceae, Pseudomonas, Acinetobacter, Bordetella or Haemophilus.
 16. (canceled)
 17. The method of claim 13, characterized in that, the infection is a nonspecific infection and/or specific infection.
 18. The method of claim 17, characterized in that, the nonspecific infection is furuncle, carbuncle, erysipelas, acute lymphangitis, acute lymphadenitis, paronychia, felon, lateral pyogenic tenosynovitis of fingers, bursitis, palm deep space infection, pyemia or bacteremia; and/or the specific infection is tuberculosis, tetanus, gas gangrene, anthrax, pertussis, epidemic encephalomyelitis, gonorrhea, typhia, bacillary dysentery or diphtheria.
 19. (canceled)
 20. The method of claim 13, characterized in that, the infection is an infection caused by MRSA, MRCNS, erythromycin-resistant Streptococcus pyogenes, ESBL-producing Escherichia coli, imipenem-resistant Pseudomonas aeruginosa; or the infection is a local infection, systemic infection or toxic disease caused by Staphylococcus aureus; or the infection is a urinary system infection, septicemia or postoperative infection, caused by coagulase-negative staphylococci; or the infection is a pyogenic inflammation, rheumatic fever and acute glomerulonephritis, scarlatina, bacterial pneumonia, saprodontia, subacute bacterial endocarditis or newborn infection, caused by Streptococcus; or the infection is lobar pneumonia, trachitis, otitis media, meningitis, pleurisy, endocarditis or septicemia, caused by Streptococcus pneumonia; or the infection is puerperal septicopyemia in pregnant women, neonatal meningitis, postpartum infection, bacteremia, endocarditis, skin and soft tissue infection or osteomyelitis, caused by Streptococcus agalactiae; or the infection is a cardiovascular system infection or urinary tract infection, caused by Enterococcus; or the infection is a urinary tract infection, pyogenic abdominal infection, septicemia, endocarditis or diarrhea fever, caused by Enterococcus faecium; or the infection is endocarditis, cholecystitis, meningitis, urinary tract infection or wound infection, caused by Enterococcus faecalis; or the infection is epidemic encephalomyelitis caused by Neisseria meningitides; or the infection is gonorrhea caused by Neisseria gonorrhoeae; or the infection is a urinary system infection, parenteral pyogenic infection, intestinal infection or hemorrhagic colitis, caused by Escherichia; or the infection is bacillary dysentery caused by Shigella; or the infection is typhia and paratyphoid caused by Salmonella; or the infection is pneumonia, bronchitis, urinary tract infection, wound infection, meningitis or peritonitis, caused by Klebsiella pneumonia; or the infection is antibiotic-associated hemorrhagic colitis caused by Klebsiella oxytoca; or the infection is pneumonia or meningitis caused by Citrobacter, or the infection is skin soft tissue infection, urinary tract infection, respiratory tract infection, abdominal infection, central nervous system infection, eye infection, wound infection, endocarditis or septicemia, caused by Enterobacter cloacae; or the infection is pneumonia, urinary tract infection, bacteremia or postoperative infection, caused by Serratia; or the infection is tetanus caused by Clostridium tetani; or the infection is gas gangrene or food poisoning caused by Clostridium perfringens; or the infection is abdominal infection, female reproductive tract and pelvic infection or bacteremia, caused by asporous anaerobic bacterium; or the infection is diphtheria caused by Corynebacterium diphtheria; or the infection is acne, comedo caused by Corynebacterium acnes; or the infection is a wound infection, burn tissue infection, lung infection, urinary tract infection, otitis media, keratitis, endocarditis or septicemia, caused by Pseudomonas aeruginosa; or the infection is a respiratory tract infection, bacteremia, urinary tract infection, secondary meningitis, surgical site infection or ventilator-associated pneumonia, caused by Acinetobacter baumannii; or the infection is pertussis caused by Bordetella pertussis; or the infection is bacteremia in infants and children, acute bacterial meningitis, cellulitis, osteomyelitis or joint infection, caused by Haemophilus such as Haemophilus influenza; or the infection is tuberculosis caused by Mycobacterium tuberculosis; or the infection is chronic refractory infection wound surface. 21-22. (canceled)
 23. A DNA molecule encoding the polypeptide of claim 1, characterized in having any one of the nucleotide sequences as set forth in I and II: I. the nucleotide sequence as set forth in SEQ ID NO: 3; II. nucleotide sequences obtained from the nucleotide sequence as set forth in SEQ ID NO: 3 with modification, substitution, deletion or addition of one or more bases.
 24. (canceled)
 25. A method for preparing a polypeptide, characterized in comprising the steps of: obtaining a DNA molecule encoding the amino acid sequence as defined in (I) or (II); wherein (I): the amino acid sequence as set forth in SEQ ID NO: 1; and (II): amino acid sequences obtained from the amino acid sequence as set forth in SEQ ID NO: 1 with modification, substitution, deletion or addition of one or more amino acids; fusing the DNA molecule with an expression vector to construct a recombinant expression vector; transforming the recombinant expression vector into a host cell to obtain a transformant; and inducing the transformant to express a protein, and then performing separation and purification, to obtain the polypeptide.
 26. The preparation method of claim 25, characterized in that, the DNA molecule comprises any one of the nucleotide sequences as set forth in I and II: I. the nucleotide sequence as set forth in SEQ ID NO: 3; II. nucleotide sequences obtained from the nucleotide sequence as set forth in SEQ ID NO: 3 with modification, substitution, deletion or addition of one or more bases.
 27. The preparation method of claim 26, characterized in that, the host cell is a prokaryotic host cell or eukaryotic host cell.
 28. The preparation method of claim 26, characterized in that, the prokaryotic host cell is Escherichia coli.
 29. A pharmaceutical formulation for the treatment of a wound surface infection and/or promotion of tissue repair and healing, characterized in that, the pharmaceutical formulation consists of the polypeptide of claim 1 and a pharmaceutically acceptable carrier.
 30. The pharmaceutical formulation of claim 29, characterized in that, the polypeptide accounts for 0.01%˜1.5% by weight of the pharmaceutical formulation; and/or the carrier comprises hydroxypropylmethylcellulose. 31-32. (canceled)
 33. The pharmaceutical formulation of claim 29, characterized in that, the pharmaceutical formulation is a gel, powder for injection, aerosol, spray, liniment, film, patch, cream, ointment, adhesive plaster, liquid, decoction, granule, tablet, pill, sustained-release agent, controlled-release agent, powder, paste, liniment, lotion, smeared film, penetration ions, eye drop, nasal drop, gargle, sublingual tablet, insufflating agent, suppository, aerosol, inhalant, fumicant, oral solution, oral tablet, injection, syrup, electuary, vinum, pulvis, granule, pill, tablet, capsule, enema or suppository.
 34. A method of manufacturing a feed, health product, food and cosmetic additive, comprising using the polypeptide of claim
 1. 